<center><p>Addition it is then, would you like to add

<%= start_form_tag ({:action => 'show_add'}) %>
 <p><%= radio_button('add', 'number', 'single') %> single digits </p>
  or
 <p> <%= radio_button('add', 'number', 'double') %> double digits </p>
<%= submit_tag "submit" %>
<%= end_form_tag %></p></center>